Conceivably all of my work could be done from home. But one portion of it would require a company provided cell phone that they could forward my extension to, and the other part would require me to run a bunch of expensive commercial software (yay CAD) on my home computer, with license servers set up to support it. Or if they don't want to let personal computers on the network, I'd need a relatively beefy company PC.

None of that's impossible, but doing it for the whole company is apparently enough effort/money that we haven't done it.

We do have a couple of remote employees, and they're a hassle with our ancient phone system. Once you transfer a call out to them there's no way for them to pass it back to the internal system. It's not a good setup for people who are frequently taking technical calls but need to send ordering/pricing questions to coworkers in customer service and quotations.